another fix

Author: paulb777

Crashlytics/UnitTests/FIRCLSContextManagerTests.m

@@ -41,11 +41,28 @@ @interface FIRCLSContextManagerTests : XCTestCase
 @implementation FIRCLSContextManagerTests
 
 - (void)setUp {
+  [super setUp];
+
+  // This is a more robust way to create a temporary directory for testing.
+  NSString *tempDirectoryTemplate =
+      [NSTemporaryDirectory() stringByAppendingPathComponent:@"FIRCLSContextManagerTests.XXXXXX"];
+  const char *tempDirectoryTemplateCString = [tempDirectoryTemplate fileSystemRepresentation];
+  char *tempDirectoryNameCString = (char *)malloc(strlen(tempDirectoryTemplateCString) + 1);
+  strcpy(tempDirectoryNameCString, tempDirectoryTemplateCString);
+
+  char *result = mkdtemp(tempDirectoryNameCString);
+  if (!result) {
+    XCTFail(@"Couldn't create temporary directory.");
+  }
+
+  NSString *tempDirectoryPath =
+      [[NSFileManager defaultManager] stringWithFileSystemRepresentation:tempDirectoryNameCString
+                                                                  length:strlen(result)];
+  free(tempDirectoryNameCString);
+
   self.fileManager = [[FIRCLSMockFileManager alloc] init];
-  [[NSFileManager defaultManager] createDirectoryAtPath:self.fileManager.rootPath
-                              withIntermediateDirectories:YES
-                                               attributes:nil
-                                                    error:nil];
+  self.fileManager.rootPath = tempDirectoryPath;
+
   [self.fileManager createReportDirectories];
   [self.fileManager setupNewPathForExecutionIdentifier:TestContextReportID];
 
@@ -57,6 +74,12 @@ - (void)setUp {
   NSString *reportPath =
       [self.fileManager.activePath stringByAppendingPathComponent:TestContextReportID];
 
+  // The report needs to be initialized with a path that actually exists.
+  [[NSFileManager defaultManager] createDirectoryAtPath:reportPath
+                            withIntermediateDirectories:YES
+                                             attributes:nil
+                                                  error:nil];
+
   self.report = [[FIRCLSInternalReport alloc] initWithPath:reportPath
                                        executionIdentifier:TestContextReportID];